Island



(No Model.) 4 Sheets-Sheet 1.

. G. W. STAFFORD & S. D. BARRETT.

SHEDDING MECHANISM FOR LOOMS.

No. 417,521. 4 Patented Dec. 17, 1889.

ATTORNEY (No Model.) 4 Sheets-Sheet 2.

G. W. STAFFORD & S. D. BARRETT.

SHBDDING MECHANISM FOR Looms,

No. 417,521. Patented Dec. 17. 1889.

4 Sheets-Sheet 3. ETT.

. (No Model.)

G. W. STAFFORD 8: S. D. BARR SHBDDING MECHANISM FOR LOOMS.

No. 417,521. Patented Dec. 17, 1889.

' INVENTUH 5 ATTORNEY WITNESSES-z N: Pains PhnXo-Ulhograpmr. Wzxhingbil. D. n

(No Model.) 4 Sheeis-Sheet '4.

G. W. STAFFORD & $J D. BARRETT. I I

SHBDDING MECHANISM FOR LOOMS.

No. 417,521. Y Patented Dec. 17, 1889.

WITQNESSES: ymv'smoas ATTORNEY UNITED STATES PATENT OFFICE.

j GEORGE W. STAFFORD AND SAMUEL D. BARRET", OF PROVIDENCE, RHODE ISLAND, ASSIGNORS TO THE GEO. W. STAFFORD MANUFACTURING COM- PANY, OF SAME PLACE.

SHEDDING MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 417,521, dated December 17, 1889.

I Application filed September 18, 1889. Serial No. 324,207. (No model.)

To all. whom it may concern.-

I Be it known that we, GEORGE W. STAF- FORD and SAMUEL D. BARRETT, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Shedding Mechanism for Looms; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had-to the accompanying drawings, and to the letters of reference marked thereon, which form apart of this specification.

This invention relates to the application to dobbies of two pattern-cylinders, each carry- I 5 ing a separate pattern-chain for the purpose of making a division of the pattern-chain, where such division can be used, to shorten the chain, as in weaving handkerchiefs or towels, where there is a long space of plain or repeated weaving and a border of more ornate design. I In case thewhole was woven with a single pattern-chain there would necessarily be a great number of bars to weave the body which would be merely a repetition of I 2 5 similar bars, and by making a separate short chain of a setof these bars and using it over and over it will accomplish all thatfa long chain of the same bars would, without all their disadvantagesof weight, cost, 850., at

0 the same time the 'border-pattern-chain cylinder would be thrown into operation at intervals as required. It comprises the combination and arrangement of the two patterncylinders and of the parts required to hold 3 5 and operate them, and is fully illustrated in the accompanying drawings.

In the drawings, Figure 1- is a side elevation'of a part of a dobby, showing the devices that operate the two pattern-cylinders 0 in presenting the bars of the pattern-chain to operate the plate-levers. Fig. 2 is the opposite side elevation to that shown in Fig. 1,

with the mechanism that throws the cylini ders in and out ofa'ction. Fig.3 is a vertical section taken down through the dobbies from right to left when in the position shown in Fig. 1, and shows the arrangement of the plate-levers that are operated by the patterni chains and the means whereby the two cyl- 5o inders and chains are made to operate the same plate-levers when required. Fig. 4 shows a mechanism for connecting the mechanism for changing the pattern-cylinders into and out of operation with the running mechanism of the loom.

In the drawings, A is a part of one of the side frames of the dobby. (All other-parts of the dobby not herein described are as shown in United States Patent No. 388,318.) A plate a is attached to the side frame to hold a rocker-shaft b, the other end of the shaft being held in a similar plate attached to the other side frame. Two'cross-arms c are fastened on the rocker-shaft b,'one near each end of the shaft which passes through the middle of the arms.

The ends of the arms 0 have bearings made in them to receive the shafts of the patterncylinders ('11 e, the shaft 1) having a rocking motion given to it, which raises one cylinder into position to operate the plate-levers and at the same time throws the other cylinder down out of action, and vice versa. 19' b are the plate-levers that operate the hooks fin manner as shown in the patent before re- 7 ferred to.

g g are a series of auxiliary levers held on a rod h. They are equal in number to the plate-levers, and are so placed as to come one under each plate-lever, so as to raise it by the inner end of the auxiliary lever when that lever is raised by the outer pattern cylinder and chain.

The pattern-cylinders d e are placed under the two series of levers, so that the inner eylinder cl when brought up into action will operate the plate-levers by the chain directly in the usual manner, and when the outer cylinder e is in like manner raised it will, through the chain and auxiliary levers g, operate the same plate-levers, according to the pins in the bars of that chain.

The mechanism for moving the cylinders d and e in and out of action consists of a pivoted plate '70, provided "with an annular rib 5 pivoted at one end 70 to the dobby-frame, and the other end 0' is connected to the outer end of the rocker-arm c. A triangular cam n, attached to the toothed wheel 3, is held loose on the rocker shaft b,and-is so placed on that 1'00 shaft as to bring the cam 72 in the center of the pivoted plate 76, that when the toothed wheel 8' is turned one tooth-space the cam 71, that is fast to it, will by one of its projections push against the upper or lower projection on the inside of the pivoted plate 7.: and raise or lower that plate, as the case may be. The toothed wheels is moved one tooth at a time, as occasion requires, by means of the sliding bar I, the forward end of which engages in the teeth of the wheel 8 and pushes it forward the space of one tooth, when the adjustable plate 0 on the end of the rocker-arm E in its vibrations strikes the bar I, which occurs whenever the rear end of that bar is raised by the indicator-bar t.

The bar I is provided with a slip-plate y, pivoted to it for the rocker-arm E to strike against, and provided with a spring p to hold the free end up, but to allow it to dropout of the way if the bar is thrown up when the end of the rocker-arm E is forward.

A springer is attached to the bar Z and to the frame below to draw the bar down and back after it has been thrown forward by the rocker-arm E. The usual step-by-step motion is given to the two pattern-cylinders d e by means of two hook-pawls r '1', pivoted to the rocker-arm E and working on two ratchetwheels f f, and as it is not desirable to turn either cylinder when it is down out of action a guard-bar c is attached to the (lobby-frame by one end and the other carried out over the cylinder-shafts in a line under the hooks '7' r, so as to prevent either hook from following its ratchet-wheel down when that particular cylinder drops out of action, and neitherhook, though continuously vibrating, can catch in the teeth of its ratchet-wheel until those teeth are raised above the guard-bar c.

Fig. l shows a means of operating the mechanism for changing the pattern-cylinders into and out of action. H is the end frame of the loom. h is a circular plate attached to the end of the cloth-roll; or it may be held on a stud and connected by gears to the cloth-roll to regulate its speed.

A horizontal lever N is held on a stud attached to the end frame. The short end of this lever is brought over the plate 71 and bent down to enter notches made in the periphery of that plate. At the other end of the lever is attached the rod 25,

which is a continuation of the rod t attached.

to the sliding bar Z, before mentioned, Fig. 2.

A close spiral springj is attached to the end frame and to the long arm of the lever, so as to draw it up and the short end down into one of the notches in the plate h, the effect of which is to throw up the rod tand the sliding bar I, so that the rocker-arm E will strike it and push the tooth-wheel s over one tooth, which changes the pattern-cylinders, as before described.

As the end of the lever rises out of the notch in the plate h the sliding bar Z is drawn down and back by its spring and is ready for the next notch in the plate as the pattern may require. The two rolls 1' t are duplicates of the cheek-roll shown in the patent above referred to. They are drawn into the recesses in the wheels .2 .2, fast on the cylinder-shafts, by the springs j'j, to check the motions of the pattern-cylinders.

Having thus described our improvements, what we claim as our invention is 1. The combination of two parallel patterncylinders held in arms attached to a rockershaftand having a ratchet-wheel attached to one end of each cylinder, two hooks pivoted to the arm E, with guard-bar c, and means for rocking said shaft, substantially as and for the purpose set forth.

2. The combination of parallel pattern-cylinders held in arms attached to a rocker-shaft, the toothed Wheel 8, cam 01., pivoted plate k, sliding plate Z, with springs p m, plate 1 the reciprocating lever E, rod t, and a time-indicating mechanism, substantially as and for the purpose set forth.

GEO. \V. STAFFORD. SAML. D. BARRETT. Witnesses:

J. A. VICKERY, BENJ. ARNOLD. 

